Every store spends October planning what to discount and almost none of them spend it building the list of people waiting for exactly that. Your Black Friday sale is a price drop. The customer who looked at a £180 jacket last week and left was not waiting for stock — they were waiting for the number to change. Nothing on your site asked them to say so.
Black Friday is 27 November 2026. A price-drop list started this week has seven weeks to fill. Started in the third week of November it has nothing.
Why the back-in-stock widget never catches this person
A notify-me form appears when a product is unavailable. It is the right tool for a customer who wants something you cannot sell them right now.
The BFCM customer has the opposite problem. The product is in stock, visible, and buyable. They can have it today. They are declining at the current price — and the only signal you get is a session that ends. They return to the product three times in a fortnight and your analytics records three sessions and no reason.
A price-drop alert asks the question directly: want to know if this gets cheaper? The answer is a named product attached to a named person, which is a better piece of first-party data than almost anything else you collect.
What the list is worth on the morning of the 27th
Compare it with what you otherwise send on Black Friday.
A campaign to your full list is one message about a sitewide discount, going to everyone — the people who want the jacket, the people who bought it in August, the people who have never bought anything. Open rates are at their lowest of the year because every store they have ever bought from is sending the same thing on the same morning.
The price-drop list is different in kind. It is sent per product, to people who named that product, and it says one thing: the thing you were watching is now £126. There is no persuading to do. The customer already decided they wanted it and told you the single condition.
It is also smaller, which people treat as a weakness and is actually the point. Two hundred people who each named a product will out-convert the same message to twenty thousand, and it costs a fraction to send.
Setting it up with seven weeks left
Put the trigger on in-stock products
This is the bit that feels wrong and is correct. The notify-me button belongs on sold-out products; the price-drop trigger belongs on products that are available and not selling as fast as you would like.
Not the whole catalogue. Put it where price is plausibly the objection: the top of your range, anything with strong traffic and a weak conversion rate, and the lines you already know will be discounted in November.
Keep it quiet
The honest objection to this feature is that it teaches people to wait for a discount. It is a real risk and it is manageable: a small text link under the price rather than a banner, no popup, and never on a product you do not intend to discount. A customer who was going to pay full price today should not be handed a reason to wait.
Used that way it does not create discount-waiters. It captures the ones you already had, who were previously invisible.
Decide what counts as a drop
Set a threshold before you need it. A 3% change is not news and sending it burns the list. Five or ten percent is a reasonable floor, and for BFCM it will be academic because your discounts will be deeper than that.
Decide too whether a drop that is reversed the same week re-triggers later. It should not — a customer who gets the same alert twice in a month reads the second one as noise.
Send per product, not per campaign
The temptation on the 27th is to blast the whole price-drop list with the sitewide offer. That throws away the only thing that made the list valuable. Each person gets the product they asked about, at its new price, with a link straight to it.
If an app cannot segment by the product subscribed to, it is not really a price-drop list, it is a newsletter with extra steps.
Have the channel ready
On the morning of the 27th every inbox your customer owns is full. A message that is read in minutes rather than that evening is worth disproportionately more than on an ordinary day, which is why SMS and WhatsApp matter in this week specifically. Offer them at signup and let the customer choose; most will pick email, and the ones who choose a phone number are telling you something about intent.
What most apps in this category do not do
Reading the live Shopify App Store listings on 6 October 2026: of the largest back-in-stock apps — Amp, STOQ and Notify Me!, which between them carry over eight thousand reviews — none lists price-drop alerts. Swym does. Stok does.
"Not listed" is not proof an app lacks a feature, and you should check in a trial rather than trust a table. But it does mean that if you are already running one of the big three, this is probably not a setting you have switched off — it is a list you do not have, seven weeks before the week it would pay for itself.
In Stok it sits on the same widget as the restock alert, with email, SMS and WhatsApp, on the $10 plan. We publish it, so weigh that accordingly — and note that those three apps have far more reviews than our 123, which is a real argument for them on everything except this.
A fortnight-by-fortnight plan
- This week: turn the trigger on for your top 20–50 products by traffic, and nothing else. Write one line of copy under the price.
- Mid-October: set the threshold and the re-trigger rule. Check the list is capturing the product, not just the email address.
- Late October: subscribe yourself, drop a price in a test, and read the message that actually arrives. Click the link.
- Early November: extend the trigger to the full set of lines you intend to discount. The list needs three weeks to be worth sending to.
- Week of the 23rd: draft the per-product message. One product, one new price, one link.
- 27 November: send per product, early, before the general campaign goes out. These people should hear first — they asked.
After BFCM, it keeps working
The reason to build this now is Black Friday. The reason it stays switched on in January is that the list keeps filling, and every markdown you run for the rest of the year has an audience waiting for it. Most stores discover the price-drop list as a BFCM tactic and keep it because it turns out to be the cheapest recurring revenue in the catalogue.
Where to go next
For the mechanics year-round, see price drop alerts. For the restock side of BFCM — send sizing, channels and cost at volume — see BFCM back-in-stock alerts, and SMS or email for the channel decision.
